A method by which the rotating blades of a scraper apparatus may be lifted from the housing has a shallow V-shaped loose connection to the drive shaft

摘要

The scraper unit has a housing (30) containing an impeller (12) on the drive shaft (10) which is rotatably fixed at one end (13) and terminates in a V groove at the other end(11) which loosely engages a corresponding hub of the scraper rotor (20) whose blades (23) are normally forced into contact with the cap (40). When the cap becomes clogged by fluff the coupling allows the scraper to lift to create a gap.